/// One line in a group chat. Besides plain text, the app posts check-ins
/// (progress logged on an objective), nudges and system notes into the same
/// thread so the conversation and the work sit together.
class GroupMessage {
  String id;

  String groupId;

  String authorId;

  String authorName;

  String body;

  /// "Text", "CheckIn", "Nudge" or "System".
  String kind;

  DateTime? sentAt;

  /// True when the signed-in user wrote it.
  bool mine;

  GroupMessage({
    this.id = "",
    this.groupId = "",
    this.authorId = "",
    this.authorName = "",
    this.body = "",
    this.kind = "Text",
    this.sentAt,
    this.mine = false,
  });

  bool get isCheckIn => kind == "CheckIn";

  bool get isNudge => kind == "Nudge";

  bool get isSystem => kind == "System";

  factory GroupMessage.fromJson(Map<String, dynamic> json) {
    return GroupMessage(
      id: json['id'] ?? "",
      groupId: json['groupId'] ?? "",
      authorId: json['authorId'] ?? "",
      authorName: json['authorName'] ?? "",
      body: json['body'] ?? "",
      kind: json['kind'] ?? "Text",
      sentAt:
          json['sentAt'] == null ? null : DateTime.tryParse(json['sentAt']),
      mine: json['mine'] ?? false,
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = <String, dynamic>{};
    data['id'] = id;
    data['groupId'] = groupId;
    data['authorId'] = authorId;
    data['authorName'] = authorName;
    data['body'] = body;
    data['kind'] = kind;
    data['sentAt'] = sentAt?.toIso8601String();
    data['mine'] = mine;
    return data;
  }
}